*Institute of Reservoir Studies, Ahmedabad ** Schlumberger Information Solutions, Vadodara [email protected], [email protected]10 th Biennial International Conference & Exposition P 427 A deterministic approach to reservoir characterization through quantitative interpretation: A case study from Heera field, Western Offshore India Singh Harjinder*., Subbrayudu K*, Moharana A**, Singh M.K.**, Kumar Amit* Summary Seismic inversion studies have traditionally been performed to quantitatively decipher the porosity variations which form an important reservoir characteristic. The seismic inversion has been carried out on the 3D PSTM volume by integrating geological, petrophysical and production data of existing wells of the Heera Field in Petrel E&P software suite. To accommodate the low frequencies, LFM (low frequency model) has been generated by applying frequency filter on acoustic impedance logs, which has been used as an input in conjunction with PSTM volume for the inversion. The acoustic impedance volume between the prominent markers was generated. There was a fair degree of co-relation between seismic generated acoustic impedance and acoustic impedance logs at well locations. Acoustic Impedance and Porosity maps have been generated at H3B top, which satisfies most of the existing well data and can be made use for further development of field. This study has revealed that low P Impedance values within the carbonates can be correlated to high porosities while higher P- Impedance values are associated with lower porosities, as encountered in the wells.The inversion output shall be used as a secondary input for property population in geocellular modeling. Keywords: Heera field, Mumbai offshore basin, Reservoir characterization Introduction One of the critical aspects in the evaluation of the prospectivity of an identified field or the development of a hydrocarbon discovery is the assessment of the reservoir quality beyond the areas covered by wells. This issue becomes increasingly more difficult in carbonate reservoirs where the distribution of porosity is more unpredictable compared to clastic reservoirs. One technique that attempts to provide reservoir characterization from seismic data is seismic inversion. Seismic inversion is the process of converting the reflectivity seismic data into acoustic impedance by making use of the suitable wavelet. Acoustic impedance is a rock property that varies with changes in lithology, porosity, fluid content, depth, pressure and temperature. Consequently, acoustic impedance can be used as an indicator of lithology, porosity and even the presence of hydrocarbons. Thus, it can also be used as a tool for qualitative and quantitative reservoir analysis and mapping of flow units. Carbonate reservoirs are notoriously heterogeneous. Seismic inversion is therefore needed to help estimate the spatial variations of rock type and porosity. Seismic inversion on the 3D PSTM volume was carried by integrating geological, petrophysical and production data for reservoir characterization in a complex multi layered producing carbonate reservoirs. Fig 1: Location of the field
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A deterministic approach to reservoir characterization · PDF filegeological, petrophysical and production data of existing wells of the Heera Field in Petrel E&P software suite. To
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*Institute of Reservoir Studies, Ahmedabad ** Schlumberger Information Solutions, Vadodara